Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2007-09-18
2007-09-18
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S158000
Reexamination Certificate
active
11286454
ABSTRACT:
A delay-locked loop (DLL) has a counter that is incremented or decremented by the loop in the process of achieving lock. The counter value is converted using an digital to analog converter (DAC) to an analog voltage that controls the delay through the delay line. During faster lock modes, the loop increments/decrements intermediate bits of the counter (with the bits less significant being held at a constant value, e.g., 0) to provide a coarse lock, rather than incrementing/decrementing the least significant bit of the counter. After coarse lock is achieved, a better lock is then achieved by incrementing/decrementing the counter using a smaller increment, i.e., a less significant bit is updated, until finally, the LSB is utilized to achieve fine lock. Utilizing the coarse lock first, and then one or more finer locks, allows the lock to be achieved more quickly.
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Daga Anand
Madrid Philip E.
Sethi Sanjay
Advanced Micro Devices , Inc.
Nguyen Linh My
Zagorin O'Brien Graham LLP
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